Effect of Anisotropy on Extracted Dielectric Properties of PCB Laminate Dielectrics


The effect of anisotropy of fiber-glass-filled epoxy resin composites, typically used as laminate dielectrics for manufacturing of printed circuit boards (PCB) is studied. It is shown that the extracted dielectric properties, the dielectric constant (Dk) and the dissipation factor (Df), depend significantly on the measurement technique, and first of all, how the electric field in a test fixture or a test vehicle is oriented with respect to the glass fiber bundles in the composite dielectric. The comparison of the dielectric properties obtained using the traveling-wave technique based on the S-parameter measurements and the split-post dielectric resonator technique are shown, and the discrepancy between the results is explained from the point of view of anisotropy and composite mixing theory.

Meeting Name

IEEE International Symposium on Electromagnetic Compatibility (2011: Aug. 14-19, Long Beach, CA)


Electrical and Computer Engineering

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory

Keywords and Phrases

Composite Dielectrics; Dielectric Resonator Technique; Dissipation Factors; Epoxy Resin Composites; Glass Fiber Bundles; Measurement Techniques; Mixing Theory; S-Parameter Measurements; Test Fixture; Test Vehicle; Traveling Wave; Anisotropy; Dielectric Devices; Dielectric Properties Of Solids; Electric Fields; Electric Properties; Electromagnetic Compatibility; Electromagnetism; Epoxy Resins; Glass Fibers; Microwave Devices; Printed Circuit Boards; Scattering Parameters; Dielectric Materials

International Standard Book Number (ISBN)

978-1457708114; 978-1457708121

International Standard Serial Number (ISSN)

2158-1118; 2158-110X

Document Type

Article - Conference proceedings

Document Version


File Type





© 2011 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Aug 2011